Please show the work for this questions thoroughly and easy to understand with answer, thank you. I've attached an image.

9. Define A(x) to be the area bounded by the t- (hor- izontal) and y-axes, the horizontal line y = 3, and the vertical line at x (see figure below). For exam- ple, A(4) = 12 is the area of the 4 x 3 rectangle. (a) Evaluate A(0), A(1), A(2), A(2.5) and A(3). (b) What area would A(4) - A(1) represent? (c) Graph y = A(x) for 0